Using ArrayList to store Lines in a text File

Question

Hey Guys,
I have the following program that I am using to read a text file and store each word in each line in an ArrayList. But I am getting the following error;
Exception in thread "main" java.util.ConcurrentModificationException
     at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:449)
     at java.util.AbstractList$Itr.next(AbstractList.java:420)
     at bus.OrderReader.parseLine(OrderReader.java:50)
     at bus.OrderReader.main(OrderReader.java:32) The code is as follows;
package bus;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.Scanner;
import java.util.Collection;
import java.util.ArrayList;
import java.util.Iterator;
public class OrderReader {
    static Collection bread = new ArrayList();
    static Collection filling = new ArrayList();
    static Iterator iter1 = filling.iterator();
    static Iterator iter2 = bread.iterator();
     private static int counter;
public static void main(String args[]){
    Scanner s = null;
    try {
        s = new Scanner(new BufferedReader(new FileReader("/Users/admin/Documents/workspace2/OBS/WebContent/WriteMe.txt")));
        s.useDelimiter("\r");
        while(s.hasNext()) {
            parseLine(s.next());
            counter++;
        s.close();
    catch(FileNotFoundException e) {
        System.out.println("cannot find the file");
        //ignore for now
    public static void parseLine(String line) {
        Scanner lineScanner = new Scanner(line);
        lineScanner.useDelimiter("#");
            bread.add(lineScanner.next());
            filling.add(lineScanner.next());
            System.out.println(iter1.next());
            System.out.println(iter2.next());
}I do not understand why this does not work. Can someone please point me in the right direction?
Thank You
Jaz

Answer 1

Instead of doing this:
bread.add(lineScanner.next());
filling.add(lineScanner.next());
System.out.println(iter1.next());
System.out.println(iter2.next());where presumably you're just printing what you just
barely added, do this:
Object breadObject = lineScanner.next();
Object fillingObject = lineScanner.next();
bread.add(breadObject);
filling.add(fillingObject);
System.out.println(breadObject);
System.out.println(fillingObject);
And get rid of the now unused iterators.Im not sure I understand quiet what is happening here. Are you creating a primitive data type of type Object and then storing all the values in that variable?
why would I do this when this only allows me to view the very last element that was added to the list? I want to view the entire list.
Thanks
Jaz
Message was edited by:
DontKnowJack